Spring request mapping with regex like in javax.ws.rs

Question

I'm trying rewrite this Google App Engine maven server repository to Spring.

I have problem with URL mapping. Maven repo server standard looks like this:

1. URL with slash at the end, points to a folder, example:

   http://127.0.0.1/testDir/
   http://127.0.0.1/testDir/testDir2/
   

2. all others (without slash at the end) point to files, example:

   http://127.0.0.1/testFile.jar
   http://127.0.0.1/testFile.jar.sha1
   http://127.0.0.1/testDir/testFile2.pom
   http://127.0.0.1/testDir/testFile2.pom.md5
   

Original app mapping for directories and for files.

There were used annotations @javax.ws.rs.Path which supports regexy differently than Spring.

I tried bunch of combinations, for example something like this:

@ResponseBody
@GetMapping("/{file: .*}")
public String test1(@PathVariable String file) {
    return "test1 " + file;
}

@ResponseBody
@GetMapping("{dir: .*[/]{1}$}")
public String test2(@PathVariable String dir) {
    return "test2 " + dir;
}

But I can't figure out how to do this in right way in Spring application.

I'd like to avoid writing a custom servlet dispatcher.

Answer 1

I had a similar problem once, also regarding a Spring implementation of a maven endpoint.

For the file endpoints, you could do something like this

/**
 * An example Maven endpoint for Jar files
 */
@GetMapping("/**/{artifactId}/{version}/{artifactId}-{version}.jar")
public ResponseEntity<String> getJar(@PathVariable("artifactId") String artifactId, @PathVariable("version") String version) {
   ...
}

This gives you the artifactId and the version, but for the groupId you would need to do some string parsing. You can get the current requestUri with the help of the ServletUriComponentsBuilder

String requestUri = ServletUriComponentsBuilder.fromCurrentRequestUri().build().toUri().toString();
// requestUri = /api/v1/com/my/groupId/an/artifact/v1/an-artifact-v1.jar

For the folder endpoints, I'm not sure if this will work, but you can give it a try

@GetMapping("/**/{artifactId}/{version}")
public ResponseEntity<String> getJar(@PathVariable("artifactId") String artifactId, @PathVariable("version") String version) {
   // groupId extracted as before from the requestUri
   ...
}